The residue of organochlorine pesticides(HCHs、DDTs) in 20 samples of shellfish collected from the marine product markets in Shandong coastal areas in April and October,2008 were detected by GC-ECD and calculated by the external standard method.The results showed that no HCHs was detected and the detection rate of DDTs was 35%,which were not above the related national standards and lower than those in other sea areas in China.The pollution situation was evidently improved compared with that in 2005.Most part...